Comparative analysis of LCL filter with active and passive damping methods for grid-interactive inverter system

This paper presents the control strategy for a three-phase LCL-filter type based grid connected inverter system for photovoltaic (PV) applications. The control strategy proposed in the paper involves the independent control of active and reactive power injected into the grid during steady state and transient conditions. In addition to that, a comparative study between active and passive damping configurations for LCL type filter resonance damping is also analyzed. The control strategy implemented on a three-phase grid connected PV-inverter is studied and verified by computer simulation based on MATLAB Simulink and the results are analyzed for effectiveness of the study.